Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

948 questions · 998 findings · 100 reviews · Headline outcomes only

No studies found 233 · 23.3%GRADE not reported 40 · 4%Very low 203 · 20.3%Low 271 · 27.2%Moderate 176 · 17.6%High 75 · 7.5%

Vitamin D given to infants vs placebo or no treatment

Hypercalcaemia · term breastfed infants to prevent vitamin D deficiency and improve bone health

Vitamin D given to infants showed no clear difference in adverse effects (hypercalcaemia) compared with placebo or no treatment (low certainty).

1 finding from 1 review

Vitamin D given to lactating mothers vs placebo or no treatment

Nutritional rickets ‐ radiological · term breastfed infants to prevent vitamin D deficiency and improve bone health

It is very uncertain whether vitamin D given to lactating mothers changes nutritional rickets ‐ radiological compared with placebo or no treatment (very low certainty).

1 finding from 1 review

Vitamin D given to lactating mothers vs placebo or no treatment

Hypercalcaemia · term breastfed infants to prevent vitamin D deficiency and improve bone health

Vitamin D given to lactating mothers showed no clear difference in adverse effects (hypercalcaemia) compared with placebo or no treatment (low certainty).

1 finding from 1 review

Vitamin D given to lactating mothers vs placebo or no treatment

Nutritional rickets ‐ biochemical Alkaline phosphatase, calcium and phosphate levels. · term breastfed infants to prevent vitamin D deficiency and improve bone health

Vitamin D given to lactating mothers may leads to lower nutritional rickets ‐ biochemical Alkaline phosphatase, calcium and… compared with placebo or no treatment (low certainty).

1 finding from 1 review

Vitamin D (higher dose) + micronutrient(s) vs vitamin D (lower dose) + micronutrient(s)

Adverse effect: hypercalciuria As defined by trialists Time frame: 3 months · children under 5 years of age

Vitamin D (higher dose) + micronutrient(s) showed no clear difference in adverse effect: hypercalciuria As defined by trialists Time frame: 3… compared with vitamin D (lower dose) + micronutrient(s) (low certainty).

1 finding from 1 review

Vitamin D (higher dose) + micronutrient(s) vs vitamin D (lower dose) + micronutrient(s)

Hypercalcaemia · children under 5 years of age

Vitamin D (higher dose) + micronutrient(s) showed no clear difference in adverse effect: hypercalcaemia As defined by trialists Time frame:… compared with vitamin D (lower dose) + micronutrient(s) (moderate certainty).

1 finding from 1 review

Vitamin D vs placebo

Ulcer healing (absolute change in individual parameters of ulcer dimensions over time: mean (SD) cm wound length reduction · people with diabetes and foot ulcers

It is very uncertain whether vitamin D changes ulcer healing (absolute change in individual parameters of ulcer… compared with placebo (very low certainty).

1 finding from 1 review

Vitamin D vs placebo

Ulcer healing (absolute change in individual parameters of ulcer dimensions over time: mean (SD) cm wound depth reduction · people with diabetes and foot ulcers

It is very uncertain whether vitamin D changes ulcer healing (absolute change in individual parameters of ulcer… compared with placebo (very low certainty).

1 finding from 1 review

Vitamin D vs placebo

Ulcer healing (absolute change in individual parameters of ulcer dimensions over time: mean (SD) cm wound width reduction · people with diabetes and foot ulcers

It is very uncertain whether vitamin D changes ulcer healing (absolute change in individual parameters of ulcer… compared with placebo (very low certainty).

1 finding from 1 review